package com.zhang.spark_1.spark_core.operator.transform

import org.apache.spark.rdd.RDD
import org.apache.spark.{SparkConf, SparkContext}

/**
 * @title:
 * @author: zhang
 * @date: 2021/12/5 18:51 
 */
object Spark02_RDD_Operator_Transform_Test {

  def main(args: Array[String]): Unit = {
    //获取spark的连接
    val conf: SparkConf = new SparkConf().setMaster("local[*]").setAppName("operator")
    val sc: SparkContext = new SparkContext(conf)
    //TODO mapPartitions 小功能：获取每个数据分区的最大值
    val rdd: RDD[Int] = sc.makeRDD(List(1, 2, 3, 4, 5, 6), 3)
    val rddMap: RDD[Int] = rdd.mapPartitions(
      iter => {
        List(iter.max).iterator
      }
    )
    rddMap.collect().foreach(println)
    sc.stop()
  }
}
